const fp = require('lodash/fp')

const cars = [
    {name: 'Ferrari FF', horsepower: 660, dollar_value: 700000, in_stock: true},
    {name: 'Spyker C12 Zagato', horsepower: 650, dollar_value: 648000, in_stock: false},
    {name: 'Jaguar XKR-S', horsepower: 550, dollar_value: 132000, in_stock: false},
    {name: 'Audi R8', horsepower: 660, dollar_value: 114200, in_stock: false},
    {name: 'Aston Martin One-77', horsepower: 750, dollar_value: 1850000, in_stock: true},
    {name: 'Pagani Huayra', horsepower: 700, dollar_value: 1300000, in_stock: false},
]

/*-------------------------------------------------------------------------------------------------------- */

//  获取数组中最后一种车是否有库存
const isLastInStock = fp.flowRight(fp.prop('in_stock'), fp.last)
console.log(isLastInStock(cars))
// false

/*-------------------------------------------------------------------------------------------------------- */

//  获取数组中第一种车的名称
const getFirstName = fp.flowRight(fp.prop('name'), fp.first)
console.log(getFirstName(cars))
//  Ferrari FF

/*-------------------------------------------------------------------------------------------------------- */

//  函数组合
const _average = xs => {
    return fp.reduce(fp.add, 0, xs)
}

const averageDollarValue = fp.flowRight(_average, fp.map((car) => car.dollar_value))
console.log(averageDollarValue(cars));
//  4744200

/*-------------------------------------------------------------------------------------------------------- */

const _underscore = fp.replace(/\W+/g, '_')

//const sanitizeNames = fp.flowRight(fp.map(_underscore), fp.map(car => fp.toLower(car.name)))

const sanitizeNames = fp.map(fp.flowRight(_underscore, fp.toLower, car => car.name))
console.log(sanitizeNames(cars))

// [
//     'ferrari_ff',
//     'spyker_c12_zagato',
//     'jaguar_xkr_s',
//     'audi_r8',
//     'aston_martin_one_77',
//     'pagani_huayra'
// ]

/*-------------------------------------------------------------------------------------------------------- */